IOServiceOpen fails
IOServiceOpen fails
- Subject: IOServiceOpen fails
- From: sanjay yaragatti <email@hidden>
- Date: Fri, 13 Oct 2006 05:38:39 +0100 (BST)
Hi,
I have written a kernel driver.Now want to talk to it
through a userclient.My user space application is a
cocoa application which calls IOServiceOpen() to
establish a connection with the userclient.The call
too IOServiceOpen fails and returning a value of hex
value of 0xe00002c7 (-536870201 in decimal).But the
API's IOMasterPort(),IOServiceMatching() &
IOServiceGetMatchingServices() are returning
success.Can anybody help me out in this matter. I have
attached the sample code..
int sample()
{
kern_return_t kernResult;
mach_port_t masterPort;
io_service_t serviceObject;
io_connect_t dataPort;
io_iterator_t iterator;
CFDictionaryRef classToMatch;
kernResult =
IOMasterPort(MACH_PORT_NULL,&masterPort);
if (kernResult != KERN_SUCCESS)
{
printf( "IOMasterPort returned %d\n", kernResult);
return 0;
}
classToMatch=IOServiceMatching(kMyDriversIOKitClassName);
if (classToMatch == NULL)
{
printf( "IOServiceMatching returned a NULL
dictionary.\n");
return 0;
}
kernResult = IOServiceGetMatchingServices(masterPort,
classToMatch, &iterator);
if (kernResult != KERN_SUCCESS)
{
printf("IOServiceGetMatchingServices returned %d\n\n",
kernResult);
return 0;
}
// Get the first item in the iterator.
serviceObject = IOIteratorNext(iterator);
// Release the io_iterator_t now that we're done with
it.
IOObjectRelease(iterator);
if (!serviceObject)
{
printf("Couldn't find any matches.\n");
return 0;
}
// This call will cause the user client to be
instantiated.
kernResult = IOServiceOpen(serviceObject,
mach_task_self(), 0, &dataPort);
if (kernResult != KERN_SUCCESS)
{
printf("IOServiceOpen returned %d\n", kernResult);
return 0;
}
Regards,
Sanjay
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